Diagnostics says battery is weak

[cpknupp]

I just did some testing with this app with my s21 and saw that it says my battery is weak? What essentially does this mean?

[patriciostarr]

You need a new battery based on your diagnostics

[2low4u76]

You also did your diagnostic test with only 29% battery life available. So if course it will show "weak"

[Cheese_Taster]

Have you considered trying the test from a full battery? If it still shows "weak", then it would mean that your battery is prone to discharging more rapidly than expected, and can only be fixed with a new battery.

[yamialex]

Well usually that means you need a new battery if you had this phone since it came out the phone's about 3 years old so 3 years worth of charging has degraded the battery